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Pulleys and Wheel and Axle Worksheet

Engineering lesson 14: Pulleys and the wheel and axle · Set 659 · 40 questions
TalentJR

Engineer's tip (Count the ropes): Fixed pulley: changes direction, effort = load. Pulley system: effort = load ÷ supporting rope sections; rope pulled = lift height × that number. Wheel and axle: MA = wheel radius ÷ axle radius; effort = load ÷ MA.

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  1. 1.True or false: a fixed pulley is on a flagpole top. (a) False (b) True
  2. 2.True or false: a fixed pulley makes you pull 2× rope. (a) False (b) True
  3. 3.🪝 Fixed or movable pulley: which one needs effort = load? (a) a fixed pulley (b) a movable pulley
  4. 4.🪝 A pulley system lifts a 360 N load with an effort of 120 N. What is its mechanical advantage (MA)?
  5. 5.🪝 Fixed or movable pulley: which one only changes direction? (a) a movable pulley (b) a fixed pulley
  6. 6.True or false: a fixed pulley halves the effort. (a) False (b) True
  7. 7.🪝 A well winch has a handle (wheel) of radius 6 cm turning an axle of radius 1 cm. What is its mechanical advantage (MA)?
  8. 8.🪝 A winch has a wheel of radius 12 cm and an axle of radius 2 cm. What effort on the wheel lifts a 300 N bucket on the axle, in newtons? (ideal)
  9. 9.🪝 A pulley system lifts a 320 N load with an effort of 160 N. What is its mechanical advantage (MA)?
  10. 10.🪝 A bucket weighing 390 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  11. 11.🪝 A wheel and axle is a big wheel fixed to … (a) a sharp wedge (b) a flat ramp (c) a loose rope (d) a smaller rod (axle)
  12. 12.True or false: a fixed pulley stays in one place. (a) True (b) False
  13. 13.🪝 A pulley system has 1 rope section holding up the load. To lift the load by 6 m, how many metres of rope must you pull?
  14. 14.🪝 Fixed or movable pulley: which one hangs on the rope loop? (a) a movable pulley (b) a fixed pulley
  15. 15.🪝 A bucket weighing 30 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  16. 16.True or false: a fixed pulley rises with the load. (a) False (b) True
  17. 17.🪝 A pulley system lifts a 260 N load with an effort of 130 N. What is its mechanical advantage (MA)?
  18. 18.🪝 A pulley system lifts a 120 N load with an effort of 30 N. What is its mechanical advantage (MA)?
  19. 19.True or false: a movable pulley needs effort = load. (a) False (b) True
  20. 20.🪝 A winch has a wheel of radius 20 cm and an axle of radius 4 cm. What effort on the wheel lifts a 750 N bucket on the axle, in newtons? (ideal)
  21. 21.🪝 A bucket weighing 60 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  22. 22.🪝 More rope sections holding a load means … (a) the load floats (b) no change (c) more effort needed (d) less effort needed
  23. 23.🪝 Fixed or movable pulley: which one is on a flagpole top? (a) a movable pulley (b) a fixed pulley
  24. 24.🪝 A pulley system has 4 rope sections holding up the load. To lift the load by 2 m, how many metres of rope must you pull?
  25. 25.🪝 A pulley system lifts a 220 N load with an effort of 110 N. What is its mechanical advantage (MA)?
  26. 26.🪝 A load of 90 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  27. 27.True or false: a movable pulley hangs on the rope loop. (a) True (b) False
  28. 28.🪝 A well winch has a handle (wheel) of radius 8 cm turning an axle of radius 2 cm. What is its mechanical advantage (MA)?
  29. 29.🪝 What does a single fixed pulley change? (a) the direction of pull (b) the size of the load (c) gravity (d) the colour of rope
  30. 30.🪝 A load of 240 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  31. 31.True or false: a fixed pulley only changes direction. (a) True (b) False
  32. 32.True or false: a movable pulley makes you pull 2× rope. (a) True (b) False
  33. 33.🪝 Fixed or movable pulley: which one rises with the load? (a) a fixed pulley (b) a movable pulley
  34. 34.True or false: a movable pulley stays in one place. (a) True (b) False
  35. 35.🪝 A pulley system lifts a 160 N load with an effort of 80 N. What is its mechanical advantage (MA)?
  36. 36.🪝 A load of 120 N hangs from a pulley system in which 3 rope sections hold up the load. What effort is needed, in newtons? (ideal pulleys)
  37. 37.🪝 A bucket weighing 300 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
  38. 38.True or false: a movable pulley only changes direction. (a) True (b) False
  39. 39.🪝 A winch has a wheel of radius 25 cm and an axle of radius 5 cm. What effort on the wheel lifts a 900 N bucket on the axle, in newtons? (ideal)
  40. 40.🪝 A pulley system lifts an 880 N load with an effort of 220 N. What is its mechanical advantage (MA)?

Answer key

  1. True
  2. False
  3. a fixed pulley
  4. 3
  5. a fixed pulley
  6. False
  7. 6
  8. 50
  9. 2
  10. 390
  11. a smaller rod (axle)
  12. True
  13. 6
  14. a movable pulley
  15. 30
  16. False
  17. 2
  18. 4
  19. False
  20. 150
  21. 60
  22. less effort needed
  23. a fixed pulley
  24. 8
  25. 2
  26. 30
  27. True
  28. 4
  29. the direction of pull
  30. 80
  31. True
  32. True
  33. a movable pulley
  34. False
  35. 2
  36. 40
  37. 300
  38. False
  39. 180
  40. 4

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